new

function Car() {}
car1 = new Car();

console.log(car1.color); // undefined

Car.prototype.color = null;
console.log(car1.color); // null

car1.color = "black";
console.log(car1.color); // black

function Car(make, model, year) {
  this.make = make;
  this.model = model;
  this.year = year;
}

var mycar = new Car("Eagle", "Talon TSi", 1993);

var kenscar = new Car("Nissan", "300ZX", 1992);

function Person(name, age, sex) {
  this.name = name;
  this.age = age;
  this.sex = sex;
}

var rand = new Person("Rand McNally", 33, "M");
var ken = new Person("Ken Jones", 39, "M");

function Car(make, model, year, owner) {
  this.make = make;
  this.model = model;
  this.year = year;
  this.owner = owner;
}

var car1 = new Car("Eagle", "Talon TSi", 1993, rand);
var car2 = new Car("Nissan", "300ZX", 1992, ken);

car2.owner.name;